Best HR software with Slack integration
PeopleMuster ranks first for a team that lives in Slack: scheduled reminders, utilisation reports and announcements post into your channels, and the $3 per person a month behind them covers every HR module. Calamari ranks second, with leave requests and clock-in inside Slack, sold as modules from $2 a head billed yearly.
How this was judged
Ranked on how much of HR one published per-person price covers, among tools whose own Slack page shows HR work reaching Slack.
Five products were compared on 24 September 2026. Every entry's Slack behaviour was read on the vendor's own Slack page that day, and every price on the vendor's own pricing page. A tool qualifies only if its Slack page shows HR work reaching Slack. The ranking then asks how many HR jobs sit behind one per-person price: leave, attendance, timesheets, the people record and the rest. Leave-only tools come after broader ones, cheapest first. Disclosure: PeopleMuster is our product, and it sits where the method puts it.
The ranking
PeopleMuster
$3 per person a month, every module included, Slack among them. $30 per person a year on annual billing.- Who it suits
- A company that runs on Slack and wants HR nudges and reports in its channels, with the HR work itself in one system.
- Where it wins
- You schedule Slack posts as one-off or recurring, such as a monthly attendance reminder or a weekly hours-submission nudge, and see each one's next run and status. Utilisation reports post to Slack in one click, and announcements go out the same way. Sync Slack links each person in the directory to their Slack handle. Leave, attendance, timesheets and tickets are handled in PeopleMuster itself.
Calamari
Per employee a month, monthly or yearly: Time Off $2.50 or $2, Time & Attendance $3 or $2.50, Core HR $2.50 or $2, Performance $3 or $2.50. 10-seat minimum, 14-day trial. Verified 24 September 2026.- Who it suits
- A team of ten or more that wants to request leave and clock in without leaving Slack.
- Where it wins
- Calamari's Slack page says staff can request time off and clock in and out in Slack, and managers can approve or reject requests there.
- Where it falls short
- Each HR area is its own module, so the bill is a sum, with a ten-seat floor.
BambooHR
Core $10, Pro $17, Elite $25 per employee a month. Teams of 25 or fewer pay a flat rate from $250 a month. Verified September 2026.- Who it suits
- A company on BambooHR that wants time off and the directory reachable from Slack.
- Where it wins
- BambooHR builds its own Slack app: employees plan time off, check balances, look up co-workers and see who's out, and approvers get notified.
- Where it falls short
- The highest per-person price in this set, and a flat rate for teams under 26.
Timetastic
Business $1.50, Pro $2.50, Rota & Time Clock $5.50 per user a month. 30-day trial, month to month. Verified 24 September 2026.- Who it suits
- A team whose main HR job is leave, with managers who approve from Slack.
- Where it wins
- A leave request lands as a Slack message that one tap approves, and each morning's absences post to your channel.
- Where it falls short
- Built around leave, with the rota and time clock on the top tier.
Vacation Tracker
Core $2 per user a month ($1 yearly), $50 a month minimum ($25 yearly). Complete $4 ($3 yearly), $100 minimum ($75 yearly). 14-day trial. Verified 24 September 2026.- Who it suits
- A Slack-first team that wants leave requests and approvals entirely inside Slack.
- Where it wins
- Time off is requested and approved in Slack, with daily or weekly leave and holiday notices by department.
- Where it falls short
- A monthly minimum applies on every plan, and the product is built around leave.
Questions people ask
What is the best HR software that integrates with Slack?
On how much HR one per-person price covers, PeopleMuster ranks first at $3 per person a month, posting reminders, reports and announcements into Slack. Calamari follows with leave and clock-in inside Slack, from $2 a module billed yearly. BambooHR's own Slack app handles time off and directory lookups, from $10 per employee.
Which HR tools post attendance and leave notifications into Slack?
Timetastic posts each morning's absences to a channel, and Vacation Tracker sends daily or weekly leave notices by department. Calamari notifies managers of pending requests in Slack. PeopleMuster posts scheduled attendance and hours reminders, utilisation reports and announcements on the dates you set.
How do I connect PeopleMuster to Slack?
An admin adds a Slack bot token, and an incoming webhook if you want one, on the integrations page. Keys are stored in your own database and never shown again in full. Then Sync Slack matches each person in the directory to their Slack handle, and scheduled posts start on their next run.